How to run someone else's poker simulation Flask application?

Question

Flask

I found a simulation of a poker game in the form of a Flask application 1. Installed

all the libraries
2. Run app.py

spoiler

"""
Flask Documentation:     http://flask.pocoo.org/docs/
Jinja2 Documentation:    http://jinja.pocoo.org/2/documentation/
Werkzeug Documentation:  http://werkzeug.pocoo.org/documentation/

This file creates your application.
"""

import os
from flask import Flask, render_template, request, redirect, url_for, json
from poker.simulator import *
from poker.parser import *

app = Flask(__name__)

app.config['SECRET_KEY'] = os.environ.get('SECRET_KEY', 'this_should_be_configured')


###
# Routing for your application.
###

@app.route('/')
def home():
    """Render website's home page."""
    heroHand = parseHand("AsKc")
    villainHand = parseHand("2c2d")

    return json.jsonify(
        simulate(heroHand, villainHand, numberOfSimulations=5000)
    )

@app.route('/equity/<hero_hand>/<villain_hand>')
def equity(hero_hand, villain_hand):
    """Render website's home page."""
    heroHand = parseHand(hero_hand)
    villainHand = parseHand(villain_hand)

    return json.jsonify(
        simulate(heroHand, villainHand, numberOfSimulations=1000)
    )


@app.route('/about/')
def about():
    """Render the website's about page."""
    return render_template('about.html')


###
# The functions below should be applicable to all Flask apps.
###

@app.route('/<file_name>.txt')
def send_text_file(file_name):
    """Send your static text file."""
    file_dot_text = file_name + '.txt'
    return app.send_static_file(file_dot_text)


@app.after_request
def add_header(response):
    """
    Add headers to both force latest IE rendering engine or Chrome Frame,
    and also to cache the rendered page for 10 minutes.
    """
    response.headers['X-UA-Compatible'] = 'IE=Edge,chrome=1'
    response.headers['Cache-Control'] = 'public, max-age=600'
    return response


@app.errorhandler(404)
def page_not_found(error):
    """Custom 404 page."""
    return render_template('404.html'), 404


if __name__ == '__main__':
    app.debug = True
    port = int(os.environ.get("PORT", 5000))
    app.run(host='localhost', port='8000')
    #app.run(host='0.0.0.0', port=port)

Obviously, in the first part, maps and the number of simulations are set
. And at the end, you already need to write host = 'localhost' and Port 8000
But in the end, I always have the same calculation.
What have I done wrong?

PS Only it is possible without jokes and expressions in style, first learn Python, graduate from a technical university, and then ask questions, etc.